In `947 Farm Management and Elementary Agricultural Economics was published by the Australian Ministry of Post-War Reconstruction. Forty lectures were prepared by R.R. McMillan and K.O. Campbell. Lecture No 17 Co-operatives ( pp. 172 - 177) - The Co-operative Movement Is Over 100 Years Old, The Rochdale Principles, The Role of Co-operation, The Co-operative Society Must Be a Business Institution, Marketing and Production Inter-related, Co-operation and the Other Economic Systems, Co-operative Societies in Australia and Post-War Possibilities. Lecture No 17 has been extracted and reproduced.